After the AT&T store sold out by 11:30 am on July 11th, I pre-ordered and was told "it will probably be here tomorrow." I heard other sales people say, "No later than the end of next week," and one guy said, "I have no idea because Apple doesn't tell us anything." It's the 19th and I'm still waiting. You can check your order status at
https://www.wireless.att.com/order_status/order_status.